I'm sure there are exceptions to this in academia, but one of the main obstacles we as white folks face in bringing white and black folks to a kind of equilibrium is that the differences in southern culture (and others, but here this particularly) are spoken of in terms of white culture. Texas, and Florida, and Georgia, and Mississippi, and Tennessee, and cetera, all defined by how the white folks carry themselves. But surely there are differences between black Texans and black Floridians, and that sort of thing, and yet it is all bled together into one black southern American experience, which is largely seen by white folks through a lens crafted at least 150 years ago.
And perhaps there is some history working against this idea. It is possible that black Americans after the war have of necessity been so mobile, looking for work and a place to call home, that the regional differences have blended to the point that differences are hard to determine from the top down.
But largely if you are black in America you are black period, and perhaps we are at a point where we can start, in a larger voice, talk about being black that allows for local culture as well as what has perhaps become a media-encouraged one.